only run if proxy variables are added

roles/docker/tasks/main.yml

@@ -56,7 +56,8 @@
 - name: allow for proxies on RHEL systems
   include: rhel-proxies.yml
   when: ansible_distribution in ["CentOS","RedHat"] and
-        ansible_distribution_major_version >= 7
+        ansible_distribution_major_version >= 7 and
+        (http_proxy is defined or https_proxy is defined or no_proxy is defined)
 
 - meta: flush_handlers